Load torque blocking device

Abstract

The invention concerns a load torque lock for automatically locking load-side torques in the case of a decrease or cessation of a drive-side torque having a housing (11) fixed to a frame, a locking ring (17) permanently connected to it and a locking body (17) cooperating with it and revolving on the drive side, with locking devices which, on the one hand, clamp on the locking ring (17) with the occurrence of a load torque by swiveling the locking body (17) by means of locking elements (27, 28) of the output shaft (15) and, on the other hand, release from the locking ring (17) by swiveling the locking body (17) back by means of driving elements (23, 24) of the drive shaft (14). To avoid undesired friction or defective jamming of the locking devices on the locking ring (18) by the centrifugal forces of the locking body (17) it is embodied in such a way that its mass center of gravity (M) lies in the area of the rotational axis of the drive shaft and the output shaft that are aligned with one another.

Description

BACKGROUND OF THE INVENTION[0001]The invention concerns a load torque lock for automatically locking load-side torques.[0002]Load torque locks belong to the species of automatically locking locks and are used in terms of their functioning with self-switching free-wheel mechanisms. They are installed as locking elements in a drive train and automatically block the torques initiated by the output mechanism in one or both directions of rotation when the driving mechanism is at an standstill, while the torques initiated by the drive side are transmitted in the one or the other direction of rotation. As a result, torques acting on the load side in a drive train can be supported and locked with the aid of the load torque lock against a stationary frame or housing. It forms a safety element, which prevents impermissible movement of the load side from outside forces or torques in the case of a decrease or cessation of the driving mechanism. Such load torque locks are suited especially for u...

AI Technical Summary

Benefits of technology

The load torque lock described in this patent has the advantage of preventing centrifugal forces on the clamping bodies by displacing the mass center of gravity to the area of rotation. This results in reliable avoidance of centrifugal-induced swiveling of the locking body and the locking ring fixed to the housing. The locking body is designed in a simple and space-saving manner as a locking disk, which is perpendicular to the axis of rotation in the housing. The locking disk is easily clamped or released by swiveling it. The locking elements engage with the locking disk in a way that allows for quick response and release of the lock. The locking disk can be swiveled in both directions of rotation, and driving and locking elements are provided for each direction. The driving elements are embodied as driving bolts and the locking elements as locking bolts or spring elements.

Problems solved by technology

However, this results in high frictional losses and poor efficiency, which leads to greater warming when high rpms are to be transmitted.

The range of application of the load torque locks functioning according to the known frictionally engaged principles of action is therefore restricted to driving mechanisms with low rpms.

Because of this off-center arrangement of the clamping or locking bodies, centrifugal forces develop in the case of a drive-side drive-though, which can for their part cause undesired tilting of the clamping or locking bodies.

However, this is only the case at a certain operating point dependent upon the driving mechanism's rpms and the torque.

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